Species: Viola pubescens var. scabriuscula Schwein. ex Torr. ex Gray

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Viola pubescens var. scabriuscula Schwein. ex Torr. ex Gray

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TAXONOMY

Family:

Violaceae

Genus:

Viola

Species Synonyms:

Viola ericarpon var. leiocarpon Fern. & Wieg.
Viola pensylvanica var. leiocarpon (Fern. & Wieg.) Fern.
Viola pubescens var. leiocarpon (Fern. & Wieg.) Seymour

Common Names:

smooth yellow violet

DISTRIBUTION

Canada:

east-central Saskatchewan – southern Manitoba – Ontario – Quebec – New Brunswick – Nova Scotia

Saskatchewan:

east-central Saskatchewan; Hudson Bay – Smoking Tent Creek – Armit

Ecoregion:

Boreal Transition, Mid-Boreal Lowland

HABITAT

Saskatchewan:

moist, lush, deciduous, floodplain woods on deep, humus-rich, alluvial soil

Associated species:

Equisetum palustre, Galium triflorum, Viola canadensis var. rugulosa

RARITY STATUS

Provincial Status According
to Harms (2003):

Threatened

Nature Conservancy Status:

G5T5 S1

Saskatchewan Species at
Risk Status:

None

COSEWIC Status:

None

Viola pubescens var. scabriuscula is threatened because it is rare and highly regionally restricted in the province. Possible threats have been identified for this species.

SPECIES DESCRIPTION

Height:

15 – 30 cm

Rhizomes:

short

Stems:

1 – several, erect or decumbent, glabrous

Leaves:

basal and cauline; basal leaves 0 – several, petiole long, blades reniform to ovate, apex pointed, margin crenate to dentate; cauline leaves 2 – 4, near top of stem, petiolate, blades ovate, base cordate, apex pointed, glabrous or nearly so; stipules large, ovate-lanceolate, leafless stipules present on lower half of stem

Inflorescence:

flowers solitary, axillary; cleistogamous flowers from upper axils

Flowers:

perfect, zygomorphic; calyx 5-merous, 6 – 10 mm long, glabrous, with a narrow white margin, spurs short; corolla 5-merous, bright yellow, lower ones 3-veined, lateral petals bearded, spur short

Fruits:

capsules 8 – 12 mm long, dark green to yellowish-green, glabrous

VIOLA KEY FOR SPECIES FOUND IN SASKATCHEWAN

1 Plants acaulescent; leaves and peduncles arising from a caudex and/or plants with stolons	2
1 Plants caulescent; flowers axillary, stolons and caudex absent	11

2 Leaves deeply divided; plants of prairies and dry areas	V. pedatifida
2 Leaves toothed or lobed but not deeply divided or margin entire; plants of meadows to moist woods or boggy areas	3

3 Flowers white, may have purplish lines towards the base	4
3 Flowers blue to violet	7

4 Plants without stolons; leaves orbicular to reniform	V. renifolia
4 Plants stoloniferous; leaves ovate to reniform	5

5 Leaves pubescent, at least when young; petioles and peduncles reddish	V. blanda var. palustriformis
5 Leaves glabrous; petioles and peduncles greenish	6

6 Leaves 2 – 5 cm long, 2.5 – 3.5 cm wide	V. palustris var. brevipes
6 Leaves 1 – 2 cm long, 1 – 1.5 cm wide	V. macloskeyi ssp. pallens

7 Rhizomes thick and fleshy; stolons absent; caudex usually short and thick; lateral petals bearded or not; sepals ciliolate or eciliolate	8
7 Rhizome slender and cord-like; stolons present or absent; caudex present or absent; lateral petals always bearded (except V. selkirkii); sepals eciliolate	10

8 Spurred petal beardless	V. sororia
8 Spurred petal bearded	9

9 Sepals ciliolate	V. septentrionalis
9 Sepals eciliolate	V. nephrophylla

10 Stolons present; petal spur much shorter than the blade; lateral petals bearded; plants of moist meadows and streams	V. palustris var. palustris
10 Stolons present; petal spur to 2/3 as long as blade; lateral petals beardless; plants of woods and rocky slopes	V. selkirkii

11 Leaves lanceolate to narrowly ovate; flowers yellow, may have purple veins at the base	12
11 Leaves cordate-ovate to reniform; flowers yellow, white or blue	13

12 Leaves usually at least three times as long as wide, lanceolate to elliptic	V. nuttallii
12 Leaves less than three times as long as wide, narrowly ovate	V. vallicola var. vallicola

13 Flowers yellow, with purplish-brown veins; plants of rich deciduous woods	V. pubescens var. scabriuscula
13 Flowers white to lilac or blue; plants of woods or meadows	14

14 Flowers white inside, yellow at base and with purplish veins or purple tinge on outside; stipules entire	V. canadensis var. rugulosa
14 Flowers blue to lilac; stipules toothed	15

15 Leaves thin, glabrous; stipules ovate; flowers lilac	V. conspersa
15 Leaves thick, glabrous to densely pubescent; flowers deep blue	16

16 Leaves densely pubescent	V. adunca var. adunca
16 Leaves glabrous	V. labradorica